Added print/println macros, Changed color, Implemented a simple panic handler

master
Ishan Jain 4 years ago
parent 9035a4f095
commit fc7992bd5f
  1. 234
      Cargo.lock
  2. 6
      Cargo.toml
  3. 0
      neptune-x86_64.json
  4. 18
      src/main.rs
  5. 26
      src/vga_buffer.rs

234
Cargo.lock generated

@ -1,5 +1,62 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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@ -8,15 +65,94 @@ dependencies = [
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[[package]]
name = "rdrand"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -27,13 +163,111 @@ name = "spin"
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@ -7,13 +7,17 @@ edition = "2018"
[dependencies]
volatile = "0.2.3"
spin = "0.4.6"
bootloader = "0.6.0"
[dependencies.lazy_static]
version = "1.0"
features = ["spin_no_std"]
[package.metadata.bootimage]
default-target = "x86_64-os.json"
default-target = "neptune-x86_64.json"
[build]
target = "neptune-x86_64.json"
[profile.dev]
panic = "abort"

@ -1,22 +1,18 @@
#![no_std] // don't include rust std lib
#![no_main] // disable all rust entry point
extern crate spin;
extern crate volatile;
#[macro_use]
extern crate lazy_static;
mod vga_buffer;
use core::fmt::Write;
use core::panic::PanicInfo;
use vga_buffer::{Buffer, Color, ColorCode, Writer};
/// This function is called on panic.
#[panic_handler]
#[no_mangle]
pub fn panic(_info: &PanicInfo) -> ! {
pub fn panic(info: &PanicInfo) -> ! {
println!("{}", info);
loop {}
}
@ -24,13 +20,9 @@ pub fn panic(_info: &PanicInfo) -> ! {
pub extern "C" fn _start() -> ! {
use core::fmt::Write;
vga_buffer::WRITER.lock().write_str("Hello again").unwrap();
write!(
vga_buffer::WRITER.lock(),
", some numbers: {} {}",
42,
1.337
)
.unwrap();
println!(", some numbers: {} {}", 42, 1.337);
panic!("panic message goes right here");
loop {}
}

@ -1,6 +1,6 @@
use core::fmt;
use volatile::Volatile;
use spin::Mutex;
use volatile::Volatile;
#[allow(dead_code)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
@ -26,6 +26,7 @@ pub enum Color {
// represents a color by combining foreground and background
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
#[repr(transparent)]
pub struct ColorCode(u8);
impl ColorCode {
@ -49,6 +50,7 @@ const BUFFER_HEIGHT: usize = 25;
const BUFFER_WIDTH: usize = 80;
// This represents the vga buffer of size 25 * 80.
#[repr(transparent)]
pub struct Buffer {
chars: [[Volatile<ScreenChar>; BUFFER_WIDTH]; BUFFER_HEIGHT],
}
@ -62,7 +64,7 @@ pub struct Writer {
lazy_static! {
pub static ref WRITER: Mutex<Writer> = Mutex::new(Writer {
column_position: 0,
color_code: ColorCode::new(Color::Yellow, Color::Black),
color_code: ColorCode::new(Color::Green, Color::Black),
buffer: unsafe { &mut *(0xb8000 as *mut Buffer) },
});
}
@ -102,7 +104,7 @@ impl Writer {
fn new_line(&mut self) {
for row in 1..BUFFER_HEIGHT {
for col in 1..BUFFER_WIDTH {
for col in 0..BUFFER_WIDTH {
let character = self.buffer.chars[row][col].read();
self.buffer.chars[row - 1][col].write(character);
}
@ -131,3 +133,21 @@ impl fmt::Write for Writer {
Ok(())
}
}
// println implementation to write to vga buffer
#[macro_export]
macro_rules! print {
($($arg:tt)*) => ($crate::vga_buffer::_print(format_args!($($arg)*)));
}
#[macro_export]
macro_rules! println {
() => ($crate::print!("\n"));
($($arg:tt)*) => ($crate::print!("{}\n", format_args!($($arg)*)));
}
#[doc(hidden)]
pub fn _print(args: fmt::Arguments) {
use core::fmt::Write;
WRITER.lock().write_fmt(args).unwrap();
}

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